Walkthrough: Since Route 8 is blocked off until after you defeat your next Island Trial, you have no choice but to head up Wela Volcano Park to take on your next Trial. Wela Volcano Park is built on an active volcano, and many Fire Type Pokemon can be found here.
Wild Pokemon:
Grasses (Levels 16-19): Fltchling(30%), Salandit(30%), Cubone(24%), Magby(15%), Kangaskhan(1%)
SOS Pokemon #1 (Levels 16-19): Fletchling, Salandit, Cubone, Magmar, Kangaskhan
SOS Pokemon #2 (Levels 16-19): Fletchling, Salandit, Kangaskhan, Magby
SOS Pokemon #3 (Levels 16-19): Fletchling, Salandit, Cubone, Magby, Kangaskhan
Zygarde Cells: There is one Zygarde Cells found here.
Trainers:
Sightseer Mariah - Level 19 Meowth
Ace Trainer Jim - Level 21 Kadabra
Hiker Calhoun - Level 18 Roggenrola, Level 19 Machop
Items:
Hyper Potion (Bottom) - On First Hill
Burn Heal (Bottom) - Southern Path
TM39 Rock Tomb (Bottom) - Near Ace Trainer Jim
Charcoal (Top) - West of Captain's Gate